Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 19,392,305	$ 18,735,073	$ 16,308,801
Cost of goods sold	13,076,036	12,751,286	11,402,403
Gross margin	6,316,269	5,983,787	4,906,398
Operating expenses:
Selling, administrative, and other expenses	4,934,167	4,615,290	3,726,233
Depreciation and amortization	270,288	241,635	167,691
Provision for doubtful accounts	14,905	17,147	13,932
Restructuring costs	112,184	0	0
Goodwill impairment charge	81,968	0	0
Total operating expenses	5,413,512	4,874,072	3,907,856
Non-operating expenses (income):
Interest expense	95,711	101,925	41,486
Other	(66,011)	(67,822)	(52,212)
Special termination costs	42,757	0	0
Total non-operating expenses (income)	72,457	34,103	(10,726)
Income before income taxes	830,300	1,075,612	1,009,268
Income taxes	209,215	265,138	392,511
Net income	$ 621,085	$ 810,474	$ 616,757
Basic net income per common share (in dollars per share)	$ 4.26	$ 5.53	$ 4.19
Diluted net income per common share (in dollars per share)	$ 4.24	$ 5.50	$ 4.18
Weighted average common shares outstanding (in shares)	145,736	146,657	147,140
Dilutive effect of stock options and nonvested restricted stock awards (in shares)	681	584	561
Weighted average common shares outstanding — assuming dilution (in shares)	146,417	147,241	147,701
Net income	$ 621,085	$ 810,474	$ 616,757
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	38,246	(233,235)	137,694
Net gain (loss) on cash flow and net investment hedges, net of income taxes of 2019 — $16,600; 2018 — $10,398; 2017 — $9,711	13,617	28,114	(17,388)
Pension and postretirement benefit adjustments, net of income taxes of 2019 — $5,036; 2018 — $21,297; 2017 — $20,539	44,433	(57,365)	40,123
Other comprehensive income (loss), net of tax	96,296	(262,486)	160,429
Comprehensive income	$ 717,381	$ 547,988	$ 777,186